CRL Storm Window Clamps are a handy exterior clamp that speeds up your storm window or screen installation time. The screw-type clamp allows for up to a 3/4 inch (19.1 millimeter) adjustment. Using a slotted screwdriver,
screw the clamp to the window jamb, place your sash or screen into position,
swing the clamp over the frame and snug down the plastic screw.